Determination of absolute molecular weight of regioregular …
· The two peaks at 2.6 and 2.8 ppm correspond to the αCH 2 groups from alkyl chains. These peaks provide vital information to determine the absolute molecular weight of the polymer and regioregularity. 21 According to the chain growth mechanism proposed by McCullough et al., 22 the peak at 2.6 ppm arises from the αCH 2 groups on the terminal tail of 3-hexylthiophene units and the peak …